html{
    font-size: 50px;
}

@media screen and (min-width:320px){
    html{
        font-size: (320px / 15);
    }
}
@media screen and (min-width:360px){
    html{
        font-size: (360px / 15);
    }
}
@media screen and (min-width:375px){
    html{
        font-size: (375px / 15);
    }
}
@media screen and (min-width:384px){
    html{
        font-size: (384px / 15);
    }
}
@media screen and (min-width:400px){
    html{
        font-size: (400px / 15);
    }
}
@media screen and (min-width:414px){
    html{
        font-size: (414px / 15);
    }
}
@media screen and (min-width:424px){
    html{
        font-size: (424px / 15);
    }
}
@media screen and (min-width:480px){
    html{
        font-size: (480px / 15);
    }
}
@media screen and (min-width:540px){
    html{
        font-size: (540px / 15);
    }
}
@media screen and (min-width:720px){
    html{
        font-size: (720px / 15);
    }
}
@media screen and (min-width:750px){
    html{
        font-size: (750px / 15);
    }
} 